Real
notifications are handy in some cases like email. But there is plenty
of less important app that wants notification permission. Turn off those
notification permissions. To do this Go to settings> Notification
and status bar> App preferences. Choose and set important push
message such as WhatsApp, what are enabled and disable other apps which
you don't use often.

2. Turn off GPS:

GPS
is another battery draining cause. Many apps request location
permission using GPS. Turn it off to save your battery. You can use
Wi-Fi-based location rather than GPS

Automatic
Brightness: It is a good choice for adjusting screen brightness. But
setting a constant brightness also save battery life. To set constant
brightness Personally I prefer constant brightness and you can access
them in Settings> Display> Brightness level.

5. Turn off vibration on press:

Every
time you press on phone display it makes vibration. It is obviously
power consuming. Turn off vibration on press to prolong battery life

6. Turn off Wi-Fi:

Turn off Wi-Fi when not needed. It is not mandatory to turn on Wi-Fi 24/7. It consumes huge battery.

7. Turn off Sync:

Syncing
is also drained battery. Though it is important for apps like email but
turn it off when not needed. You can turn in off in Settings>Sync.

8. Turn off excessive vibration:

Vibration
kills your battery life. Try to avoid vibration mode. For app
notification, you can turn it off in Settings> Notification and
status bar> App notification> Choose only apps you want them to
vibrate.

9. Turn off auto update:

Apps
like Google Play store and mi app store constantly connect to the
server to check for updated app. This process drains battery fast. Turn
off auto update to prolong battery life

10. Shorten Screen Timeout time:

Screen
consumes huge battery. You can save some charge by shortening screen
timeout time. Head towards Settings> Lock screen and password>
Sleep and choose the time you prefer

11. Use static wallpaper instead of live wallpaper:

You can save some battery by shortening Use static wallpaper instead of live wallpaper Try to avoid live wallpapers.

12. Turn on Airplane Mode in low signal areas:

Phone consumes most battery in week signal area. So, turn on airplane mode when the signal is too poor.